JPH04372274A - Picture reader - Google Patents

Abstract

PURPOSE:To adjust the position of a supported member such as a picture sensor simply and properly by burying a fixed member to a gap between a support hole and a support member so as to fix the supported member to the support member after the position of the supported member is adjusted. CONSTITUTION:A printed circuit board 16 as a supported member on which a picture sensor 11 is mounted is supported by a support claw A of an adjustment jig. A support member 14 to fix the printed circuit board 16 is provided onto the reader main body 15 and a steel plate with Sn plating or the like for providing ease of soldering being a fixing member is used for the support member 14. After the main scanning and the subscanning positions of a read picture are adjusted, the picture sensor is fixed by using the fixing means to bury the gap between the picture sensor support member 14 and the printed circuit board 16. The solder is used as the fixing member and earthing is ensured by soldering the support member 14 from both sides of the support hole of the printed circuit board 16.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical adjustment mechanism for an image sensor in an image reading apparatus that reads an image on a document using an image sensor.

0002

2. Description of the Related Art As shown in FIG. 3, an image reading device such as a copying machine or an image scanner irradiates a document placed on a document table gas 133 with a light source 134 of a first mirror table U1, and the reflected light is reflected by a mirror. 135, a mirror 136 and a mirror 137 mounted on the second mirror stand U2 lead to the image sensor stand U3, and an image is formed on the image sensor 131 using the lens 132. Then, the document platen glass 13
Parallel to 3 are a first mirror stand U1 and a second mirror stand U2.
A so-called 1:1/2 optical system, which reads a document on a document table glass by scanning the document at a speed ratio of 1:1/2, is often used.

[0003] The accuracy of the read image depends on the mounting position and angle of the image sensor 131 and lens 132. The details will be explained using FIG. 4. A represents the main scanning line of the original to be read, B represents the main scanning line of the image sensor, and C represents the lens. Take the axes and let the directions of rotation for each axis be XR, YR, and ZR. Blur caused by the inclination of the image sensor light-receiving surface from a plane perpendicular to the lens optical axis (Y-axis) (deviation with respect to the ZR direction, hereinafter referred to as one-sided blur), and caused by the image sensor light-receiving surface being shifted from the image-side focal plane of the lens 132 Blur (deviation in the Y direction between B and C, hereinafter referred to as defocus), deviation in main scanning magnification due to deviation of each distance between the document surface, lens, and image sensor light receiving surface from the predetermined dimensions (between A and C, Relative deviation in the Y direction between C and B (hereinafter referred to as magnification deviation), positional deviation due to deviation of the image sensor light-receiving surface from the main scanning position and sub-scanning position with respect to the reading reference on the document surface (X direction,
There is a deviation in the Z direction and YR direction (hereinafter referred to as positional deviation).

Optical adjustment of the image sensors is performed independently. FIG. 5 shows an example of a schematic configuration on an image sensor stand U3 in a conventional optical adjustment mechanism of an image sensor. The following members must be used for optical adjustment of the conventional image sensor 131: a one-sided blur adjustment member 153, a focus adjustment member 154, and a member 155 (hereinafter referred to as magnification adjustment) that integrates the lens and image sensor into a unit and adjusts the magnification deviation. ), main scanning position deviation/sub-scanning position deviation adjustment member 156
(hereinafter referred to as a positional deviation adjustment member), a printed circuit board 151 on which an image sensor is mounted, and a positional deviation adjustment member 156
are soldered, and the other members are fixed with screws.

For optical adjustment, first rotate the one-sided blur adjustment member 153 in the direction of arrow a to arrange the image sensor light-receiving surface on a plane perpendicular to the lens optical axis, and then rotate the focus adjustment member 15
4 and tighten the screws. Then, by moving the focus adjustment member 154, the lens 152, and the magnification adjustment member 155 in the direction of arrow b, the image sensor light receiving surface is placed at the in-focus position of the lens, and the focus adjustment member 154 and the magnification adjustment member 155 are screwed together. . Further, the lens and the image sensor are arranged at predetermined positions, adjusted to a predetermined magnification, and the magnification adjustment member 155 is screwed to the image sensor stand (not shown). Finally, move the positional deviation adjustment member 156 in the directions of arrows c, d, and e to adjust the main scanning position and sub-scanning position of the read image, and tighten the screws to the one-sided blurring adjustment member 153 to complete the adjustment operation. .

[0006]

The optical adjustment of the image sensor described above requires independent adjustment members for each optical adjustment, and further requires screws for fixing each adjustment member. In addition, since the adjustment member is fixed by screw tightening, the adjustment is likely to be misaligned, so that the adjustment takes a long time. Furthermore, accuracy depends on the proficiency level of the assembly worker.

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide an image reading device that can easily and accurately adjust the position of a member to be held, such as an image sensor.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an image reading device including a holding mechanism for holding a member to be held in a predetermined position, in which the holding mechanism is fixed to the main body of the device. a support member installed in a state in which
A support hole provided in the held member that is fitted into the support member with play, and a gap between the support hole and the support member when the support hole passes through the support member with play. and fixing means for filling.

[0009] It is also preferable that the fixing means is made of adhesive.

[0010] Also, it is preferable that the fixing means be made of welding.

[0011] Furthermore, it is desirable that the fixing means be made of solder.

0012

[Operation] In the present invention having the above structure, the support member is fitted into the support hole of the held member with some play, and the position of the held member is adjusted. After the adjustment, the fixing member is embedded in the gap between the support hole and the support member, and the held member is fixed to the support member.

[0013] If adhesive, welding, or solder is used as the fixing member, the fixation will be stronger.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the illustrated embodiments. FIG. 1 shows a schematic configuration of an adjustment mechanism for an image sensor according to the present invention. A printed circuit board 16 as a member to be held on which the image sensor 11 is mounted is held by a holding claw A of the adjustment tool. There is a support member 14 on the device main body 15 for fixing a printed circuit board 16, and the support member 14 is made of a steel plate plated with Sn or the like so that solder as a fixing means F is easily attached. Here, the support member 14
, the support hole 23a, and the fixing means F constitute a holding mechanism H.

The positional relationship between the support member 14 and the printed circuit board 16 is as shown in FIG. 2, and the support hole 23a is provided on the ground pattern resist 23, and the ground pattern resist 23 is a through hole. Further, the adjustment tool has a stage corresponding to each adjustment direction of unilateral blur, defocus, magnification shift, main scanning position shift, and sub-scanning position shift.

Optical adjustment is performed by first rotating the printed circuit board 16 in the direction of arrow a to adjust the inclination of the image sensor light receiving surface with respect to a plane perpendicular to the lens optical axis. and,
By moving the printed circuit board 16 and the lens 12 in the direction of arrow b, the image-side focal plane of the lens and the light-receiving surface of the image sensor are adjusted. Further, by moving the lens 12 and the printed circuit board 16 in the direction of arrow b, the magnification is adjusted to a predetermined value, and the magnification is adjusted to a predetermined position. Finally, the printed circuit board 16 is moved in the directions of arrows c and d and rotated in the direction of arrow e to adjust the main scanning position and sub-scanning position of the read image, and the adjustment operation is completed.

Thereafter, the image sensor is fixed by a fixing means F that fills the gap between the image sensor support member 14 and the printed circuit board 16.

Here, using solder as the fixing means F,
Support member 1 from both sides of support hole 23a of printed circuit board 16
Soldering 4 will ensure the grounding.

Furthermore, an adhesive such as epoxy resin may be used as the fixing means F, but in this case, the supporting member 14
It is not necessary to apply Sn plating to the surface.

Furthermore, welding may be used as the fixing means F.

[0021]

Effects of the Invention In the present invention having the above structure and operation, after adjusting the position of the held member, the fixing member is embedded in the gap between the support hole and the supporting member, and the held member is attached to the supporting member. Therefore, the number of adjusting members for adjusting the position of the held member is greatly reduced, and the process for fixing the member is also reduced. In addition, instead of repeating the fixing of each adjusting member for each member fixing process, it is now possible to fix the member to be held after all position adjustments have been completed, making it possible to use screw tightening as with conventional devices. There is no risk of misalignment. Further, the adjustment time can be shortened, and the accuracy is not affected by the proficiency level of the assembly worker.

Further, by using adhesive, welding, or solder as the fixing member, even stronger fixing can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of main parts of an image reading device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of essential parts of the device.

FIG. 3 is a diagram showing a schematic configuration of a general image reading device.

FIG. 4 is a diagram illustrating the accuracy of an image.

FIG. 5 is a schematic perspective view of main parts of a conventional image reading device.

[Explanation of symbols]

14 Support member 15　Device body 16 Printed circuit board (member to be held) 23a Support hole F　Fixing means H Holding mechanism

Claims (4)

[Claims] 1. An image reading device including a holding mechanism for holding a member to be held in a predetermined position, wherein the holding mechanism includes a supporting member fixedly attached to the main body of the device, and a supporting member having play. comprising a support hole provided in the held member that is fitted into the support hole, and a fixing means that fills a gap between the support hole and the support member when the support hole loosely penetrates the support member. An image reading device characterized by: 2. The image reading device according to claim 1, wherein the fixing means is made of adhesive. 3. The image reading device according to claim 1, wherein the fixing means comprises welding. 4. The image reading device according to claim 1, wherein the fixing means is made of solder.